SlideBackingBean.java

package com.ese.ils.beta.beans;

import java.io.Serializable;
import java.io.UnsupportedEncodingException;
import java.net.InetAddress;
import java.net.URLEncoder;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;

import javax.faces.bean.ManagedBean;
import javax.faces.bean.ManagedProperty;
import javax.faces.bean.ViewScoped;
import javax.faces.context.ExternalContext;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;

import com.ese.ils.beta.model.Slide;
import com.ese.ils.beta.service.FavoriteLocalServiceUtil;
import com.ese.ils.beta.service.PanicButtonLocalServiceUtil;
import com.ese.ils.beta.service.SlideLocalServiceUtil;
import com.liferay.portal.kernel.exception.PortalException;
import com.liferay.portal.kernel.exception.SystemException;
import com.liferay.portal.util.PortalUtil;
import com.liferay.portlet.documentlibrary.model.DLFileEntry;
import com.liferay.portlet.documentlibrary.service.DLFileEntryLocalServiceUtil;

/**
 * Beinhaltet Logik der mit der Folienansicht verbundenen Funktionen
 * @author eduard walter
 *
 */
@ManagedBean
@ViewScoped
public class SlideBackingBean implements Serializable {


	private static final long serialVersionUID = 9066560016598290294L;

	private List<SlideModelBean> slideModelList;
	
	@ManagedProperty(value="#{slideModelBean}")
	private transient SlideModelBean slideModelBean;
	
	@ManagedProperty(value="#{moduleModelBean}")
	private transient ModuleModelBean moduleModelBean;
	
	private String slideUrl;
	private int currentSlideIndex = 0;
	private int slideCount = -1;
	private boolean favoriteDisabled = false;
	private boolean panicDisabled = false;
	
	/**
	 * zeigt einen foliensatz an, durch den startIndex kann die Startfolie
	 * bestimmt werden
	 * @param moduleId
	 * @param startIndex
	 */
	public void showSlides(long moduleId, int startIndex) {
		slideModelList = fetchSlideList(moduleId);
		setSlideCount(slideModelList.size());
		currentSlideIndex=startIndex;
		setSlideModelBean(slideModelList.get(startIndex));
		slideUrl = slideModelBean.getUrl();
	}
	
	/**
	 * Zeigt eine Folienvorschau an
	 * @param previewIndex
	 */
	public void showPreview(int previewIndex){
		slideModelBean = slideModelList.get(previewIndex);
		slideUrl=slideModelBean.getUrl();
	}
	
	/**
	 * Ermittelt den Index einer Folie und zeigt diese ueber die
	 * Methode showSlides an
	 * @param slideId
	 */
	public void showSlide(String slideId){
		try {
			Slide slide = SlideLocalServiceUtil.fetchSlide(Long.valueOf(slideId));
			showSlides(slide.getModuleId(),slide.getIndex());
		} catch (NumberFormatException e) {		
			e.printStackTrace();
		} catch (SystemException e) {		
			e.printStackTrace();
		}
	}
	
	/**
	 * Laedt einen Foliensatz aus der DB und liefer eine
	 * List vom Typ SlideModelBean
	 * @param moduleId
	 * @return List<SlideModelBean> slideModelList
	 */
	public List<SlideModelBean> fetchSlideList(long moduleId){
		slideModelList = new ArrayList<SlideModelBean>();
		for(Slide slide : SlideLocalServiceUtil.fetchModuleSlides(moduleId)){
			int i = 0;
			SlideModelBean slideModel = new SlideModelBean();
			slideModel.setFileEntryId(slide.getFileEntryId());
			slideModel.setIndex(i);
			slideModel.setModuleId(slide.getModuleId());
			slideModel.setSlideId(slide.getSlideId());
			slideModel.setUrl(getURL(Long.valueOf(slide.getFileEntryId())));
			slideModelList.add(slideModel);
			i++;
		}
		return slideModelList;	
	}
	
	/**
	 * Gibt die URL einer Folie zurueck, ueber diese URL kann das entsprechende
	 * Bild aufgerufen werden
	 * @param fileEntryId
	 * @return
	 */
	public String getURL(long fileEntryId){
		String url ="FAIL";
		String prefix = "pre-fail";
		try {
			prefix = PortalUtil.getPortalURL(InetAddress.getLocalHost().getHostAddress(), PortalUtil.getPortalPort(), false);			
			DLFileEntry entry = DLFileEntryLocalServiceUtil.getDLFileEntry(fileEntryId);
			System.out.println("prefix: "+prefix);
			url = (prefix+"/documents/" + entry.getGroupId() + "/" + entry.getFolderId() + "/" + URLEncoder.encode(entry.getTitle(), "utf-8"));
			System.out.println(url);
		} catch (PortalException e) {	
			e.printStackTrace();
		} catch (SystemException e) {	
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}	
		return url;
	}
	
	/**
	 * Blaettert eine Folie nach links
	 * @param event
	 */
	public void browseLeft(ActionEvent event){
		System.out.println("left "+currentSlideIndex);
		if(currentSlideIndex!=0){
			currentSlideIndex--;
			slideModelBean = slideModelList.get(currentSlideIndex);
			slideUrl=slideModelBean.getUrl();
			favoriteDisabled=false;
			panicDisabled=false;
		}
	}
	
	/**
	 * Blaettert eine Folie nach rechts
	 * @param event
	 */
	public void browseRight(ActionEvent event){
		System.out.println("right "+currentSlideIndex);
		if(currentSlideIndex!=slideModelList.size()-1){
			currentSlideIndex++;
			slideModelBean = slideModelList.get(currentSlideIndex);
			System.out.println(slideModelBean.getModuleId());
			slideUrl=slideModelBean.getUrl();
			favoriteDisabled=false;
			panicDisabled=false;
		}
	}
	
	/**
	 * Legt einen Favoriten fuer die aktuelle Folie in der DB an
	 * @param event
	 */
	public void pushFavorite(ActionEvent event){
		if(FavoriteLocalServiceUtil.addFavorite(slideModelBean.getSlideId(),slideModelBean.getModuleId(),getCurrentUserId())){
			favoriteDisabled=true;
		}
	}
	
	/**
	 * Loest den PanicButton aus und loggt den Vorfall in der DB
	 * @param event
	 */
	public void pushPanic(ActionEvent event){
		PanicButtonLocalServiceUtil.setPanic(slideModelBean.getModuleId(), slideModelBean.getSlideId(),getCurrentUserId());
		panicDisabled=true;
	}

	public List<SlideModelBean> getSlideModelList() {
		return slideModelList;
	}

	public void setSlideModelList(List<SlideModelBean> slideModelList) {
		this.slideModelList = slideModelList;
	}
	
	public SlideModelBean getSlideModelBean() {
		return slideModelBean;
	}

	public void setSlideModelBean(SlideModelBean slideModelBean) {
		this.slideModelBean = slideModelBean;
	}

	public String getSlideUrl() {
		return slideUrl;
	}

	public void setSlideUrl(String slideUrl) {
		this.slideUrl = slideUrl;
	}

	public int getCurrentSlideIndex() {
		return currentSlideIndex;
	}

	public void setCurrentSlideIndex(int currentSlideIndex) {
		this.currentSlideIndex = currentSlideIndex;
	}

	public ModuleModelBean getModuleModelBean() {
		return moduleModelBean;
	}

	public void setModuleModelBean(ModuleModelBean moduleModelBean) {
		this.moduleModelBean = moduleModelBean;
	}
	public boolean isFavoriteDisabled() {
		return FavoriteLocalServiceUtil.isFavorite(slideModelList.get(currentSlideIndex).getSlideId(), 
				getCurrentUserId());
	}
	public void setFavoriteDisabled(boolean favoriteDisabled) {
		this.favoriteDisabled = favoriteDisabled;
	}
	public boolean isPanicDisabled() {
		return panicDisabled;
	}
	public void setPanicDisabled(boolean panicDisabled) {
		this.panicDisabled = panicDisabled;
	}

	public int getSlideCount() {
		return slideCount;
	}

	public void setSlideCount(int slideCount) {
		this.slideCount = slideCount;
	}
	
	private long getCurrentUserId() {
		FacesContext fc = FacesContext.getCurrentInstance();
		ExternalContext externalContext = fc.getExternalContext();
		long id = Long.parseLong(externalContext.getUserPrincipal().getName());
		return id;
	}
}